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Abstract
A new digital control system has been developed for the HB600 series of cold field-emission STEM’S manufactured by VG Microscopes. The philosophy behind this control scheme has been to develop a system which is both user-friendly for non-experts in STEM/TEM operation as well as offering access to all functions for unusual modes of operation.The control scheme, as shown in Fig.1, is based on two computers; one for instrument control, using a multi-tasking, real-time operating system (OS/2) with a graphical user interface (Presentation Manager), the other for control of image acquisition and display.The instrument control computer controls the high voltage power supply, column and stepper motor electronics via opto-isolated serial lines (RS232). The system is interrupt driven and therefore minimises the computer traffic which has the potential for causing interference in highly stable systems. An Ethernet link connects the two computers and a link to an external computer can also be implemented.
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Schedule a callMore From: Proceedings, annual meeting, Electron Microscopy Society of America
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